Main season (one just gone was all teams played each other).
In my four seasons playing div.4 mens (two summer, two winter) the first summer season was in conferences as well, then we split into crossover games against the other conference for four weeks at the end of the season. This decided the final ladder positions which was followed by a top 4 finals series.
I hope that makes sense. I guess seeing as there are alot of teams from down south, and vice versa North I guess for the shorter season they figured it was easier.